Mechanical fuel pump?

[Daves69Coupe]

So when i purchased my car from the previous owner the car came with an external electric pump. I assume this is becuase its an 86 302 engine and has an EFI timing cover. Will a mechanical fuel pump work on a orginal EFI motor by switching out to the correct timing cover and fuel pump configuration?

 

[janschutz]

That is what I did with my 88 351W roller block

 

[Daves69Coupe]

ok thanks Janschutz. I wanted to make sure before i bought anything.

 

[66benchcoupe]

Just jake sure the eccentric for the mechanical pump is on the cam(!) sprocket.

Robert

 

[Johnny M]

So when i purchased my car from the previous owner the car came with an external electric pump. I assume this is becuase its an 86 302 engine and has an EFI timing cover. Will a mechanical fuel pump work on a orginal EFI motor by switching out to the correct timing cover and fuel pump configuration?

Why are you changing back to a mechanical pump?

 

[Daves69Coupe]

Why are you changing back to a mechanical pump?

I dont wana hack up my stock fuel line so I can mount an electrc pump at the back of the car. I already installed the stock line in the car and has gas in it. Also i wont have to worry about wiring the electric fuel pump with relays and things like that. Mechanical seems simpler at this point.

 

[cmayna]

I can't argue for I have never had a problem with mechanical fuel pumps.

 

[monkeystash]

Just jake sure the eccentric for the mechanical pump is on the crank cam sprocket.

Robert

Fixed for ya.

I think you'll be happy going to a mechanical pump. Reliable, quiet, and no running wires.

 

[Johnny M]

So ,is it much of a disadvantage when starting the motor?

 

[AzPete]

So ,is it much of a disadvantage when starting the motor?

If your car sits for a time, allowing the gas to evaporate/disappear out of the carb, the mechanical pump means cranking on the starter while gas is pumped to the carb. Normal for any system like that. An elec. pump means you turn the key to on and let the pump run a bit to fill the carb, then start the engine. As long as each system delivers the required amount of gas for the engine setup, either will work fine for a running engine. Higher output engines sometimes require more fuel than a mechanical pump can put out.

 

[blown66]

AzPete lets say I am using a mechanical fuel pump and it just wont keep up with the pressure I need at the carbs is there a electric pump that can be used as a pusher to help keep the mechanical pump at pressure all the time OR would I need to go to a all out electric pump with regulator? Thanks

 

[monkeystash]

Anyone needing more pressure or volume, but still wanting a mechanical pump should look at these. It's a simple piston pump vs the traditional diaphragm.

http://racepumps.com/index.html

 

[AzPete]

I would not try running two pumps. Get a single setup, be it the mechanical listed above or an elec. A lot less hassle if problems develop.

 

[Daves69Coupe]

Anyone needing more pressure or volume, but still wanting a mechanical pump should look at these. It's a simple piston pump vs the traditional diaphragm.

http://racepumps.com/index.html

might invest in one of these when i start racing and add a lil hp

 

[monkeystash]

might invest in one of these when i start racing and add a lil hp

Yep, definitely overkill for anything less than heavily modified.

 

[Johnny M]

So i am running a 428 with 400+hp, 750cfm 4brl Carb with an 80 gpm mechanical fuel pump....Will this setup work?

http://www.summitracing.com/parts/HLY-12-832/

 

[monkeystash]

So i am running a 428 with 400+hp, 750cfm 4brl Carb with an 80 gpm mechanical fuel pump....Will this setup work?

http://www.summitracing.com/parts/HLY-12-832/

According to Holley, you need .5lb of fuel per HP, per hour. At 400HP, you need 33.33 GPH. The 80 GPH pump should be fine. The 1/4" inlet/outlet seem small, but I'm sure they took that into account.

 

[Johnny M]

According to Holley, you need .5lb of fuel per HP, per hour. At 400HP, you need 33.33 GPH. The 80 GPH pump should be fine. The 1/4" inlet/outlet seem small, but I'm sure they took that into account.

Sweet...thanks for the info.

 

[blown66]

Those pumps are nice but with useing two holleys 600dps i would have to buy two at 319 apeice..dont think I can go that way and the Regulators are 129 apeice so I would be looking at 638 dollars and some change... for the pumps and 258 for the Regulators...little spendy for me...

 

[monkeystash]

Those pumps are nice but with useing two holleys 600dps i would have to buy two at 319 apeice..dont think I can go that way and the Regulators are 129 apeice so I would be looking at 638 dollars and some change... for the pumps and 258 for the Regulators...little spendy for me...

There is no need to double up. 1 pump and 1 regulator can feed 2 carbs. I don't even know how you could run 2 mechanical pumps, because the engine only has 1 provision on the timing cover. :shrug The regulator has 2 -8 outs which you could split to 2 -6 feeds to each carb.